Diagonal stone honing tool



Nov. 10, 1959 D. T. PEDEN DIAGONAL STONE HONING TOOL Filed June 22, 1955 170 uyjds IN VEN TOR. 71' F9 Z9 7!.

United States Patent DIAGONAL STONE HONING TOOL Application June 22,1955, Serial No. 517,309 3 Claims. c1. 51-'184.1)

This inventionrelates to honing tools, and particularly'to honing tools which are especially adapted for honmg, the surfaces of cylinders of both-the internal and external type which terminate against an abutting wall. Thetool of the present invention comprises a body having semicylindrical slots in which semicylindrical stones are disposed about the axis of the body. Centrally of the body an adjusting device is provided consisting of a push rod having vanes on the ends which engage the inner ends of the stones.- The stones are fed lengthwise into engagement with the surface of a cylindrical workpiece to be honed. The ends of the stone are disposed at an angle to the flat side so as to be substantially at right angles to each other, with the cylindrical and flat side of the body of the stone encased by a sheath of plastic, paper, metal or other material to eliminate the abrasion which otherwise would occur. This permits the uncovered working face to assume the shape of a section of a cylinder having a diameter of the cylindrical wall to be honed. By having the stone semicylindrical in cross section, it is impossible to assemble the stones in any except the proper manner, to have the face substantially mate with the surface of the workpiece to be honed.

Accordingly, the main objects of the invention are: to provide a honing tool having semicylindrical slots which converge or diverge relative to a cylindrical surface to be honed containing stones of semicylindrical cross section which are moved longitudinally to change the diameter of the tool; to form in the body of the tool a plurality of angularly disposed semicylindrical slots located on radii from the body axis and communicating with the slots in which pressure applying arms are moved to urge the stones lengthwise to have the end faces engage the surface to be honed, and, in general, to provide a honing tool with a plurality of stones movable lengthwise in angularly disposed slots to have the end abrading faces located at the bottom of the tool body.

Other objects and features of novelty of the invention will be specifically pointed out or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure l is a sectional view in elevation of a honing tool embodying features of the present invention;

Fig. 2 is a sectional view of the structure illustrated in Fig. 1, taken on the line 22 thereof;

Fig. 3 is an enlarged sectional view of the structure illustrated in Fig. 1, taken on the line 33 thereof;

Fig. 4 is a bottom view of the tool illustrated in Fig. 1; and

Fig. 5 is a sectional view of a tool, similar to that illustrated in Fig. 1, showing another form thereof.

Referring to Figs. 1 to 4, the honing tool 10 of the pres ent invention comprises a body 11 having a central aperture 12 in which a driving head 13 is secured by a collar 14 secured to the body by the thread engagement 15 therebetween. A pin 16 extends within an aperture in the head 13 and into one of a plurality of slots 17 in ice the body 11. Operating arms 18 extend into the slots 17 and are secured to a head 19 attached to the end of an adjustable rod 21. The botom of the aperture 12 is enlarged at 22 to receive a cylindrical workpiece 23 which projects upwardly within the tool body. As is evident from Figs. 1 and 3, a plurality of cylindrical apertures 24 are disposed in radial planes from the center of the body in alignment with the operating arms 18 and at an angle to the vertical, converging inwardly so as to extend into the enlarged end aperture 22. The outer portions of the apertures 24 are milled, broached, or otherwise machined to receive a rectangular backing member 25 which is secured in position by screws 26. The upper portion 27 of the backing member 25 has a slot therein in alignment with the slot 17 in the body. In this manner, the apertures 24 become semicylindrical in shape for receiving a semicylindrical honing stone 28 having the flat and arcuate surfaces and the upper end surfaces'encased in a nonabrasive material 29 which may be a coating of plastic, paper or the like. The end face 31 of the stone is uncovered and is shaped into a section of a cylinder so as to mate with the cylindrical surface of the workpiece 23 and to shape itself to such surface during the honing operation as the grain structure of the face breaks down under the pressure applied by the operating arms 18. The head 13 is clamped to a reciprocable and rotatable spindle of a machine by a collar 32. An end 33 on the rod 21 is connected to a feed control device of the machine for advancing the rod 21. The rod 21 moves the operating arms 18 and the stone 28 so that the faces 31 thereof engage the surface of the Workpiece. A predetermined pressure between the faces 31 is applied by the arms 18 and the engaged surface of the workpiece as the tool is reciprocated and rotated over the entire length of the workpiece surface until size is reached. Thereafter the rod 21 is retracted, permitting the stones 28 to back up in the slots 24 and the tool to be removed from the workpiece.

A tool similar to that of Figs. 1 to 4 is illustrated in Fig. 5, with the exception that the tool has the stones diverging downwardly from the center to machine the internal surface of a bore, preferably that of a blind hole. In this manner, the semicylindrical apertures 35 pro vided in the body 36 are radially disposed and tilted at an angle in the radial planes so as to diverge from the top and project outwardly of the body at the bottom thereof. Arms 18 operate in slots 37 in the body and in slots 39 in the backing plates 38. The backing plates reduce the cylindrical opening to a semicylindrical opening, the same as in the tool of Figs. 1 to 4. As the rod 21 is moved downwardly, the arms 18 move the stones 41 outwardly and form on each outer working face 42 a convex cylindrical section conforming to the surface of the internal bore being honed.

The tools of Figs. 1 to 5 have the advantage of being able to reach to the very end of a blind bore or piston so as to uniformly machine the surface thereof from the top to the bottom. It is to be understood that the body 36 has the head 13 thereof secured to a machine by a collar 32 and that the end 33 of the rod 21 is secured to the feed mechanism thereof. It will be noted in this arrangement that the stones 41 when of the same diameter are interchangeable in the tools of Figs. 1 and 5, with the exception that the working faces 23 of the stones 28 are concave while the working faces 42 of the stones 41 are convex. The faces shape themselves quickly to the cylindrical surface being honed due to the breaking down of the abrasive bond from which the stones are constructed.

What is claimed is:

1. In a honing tool having a body containing a plurality of angularly disposed cylindrical slots opening from 3 3 the body at the extreme end thereof, a backing block within each slot changing the cross section of the apertures to semicylindrical shape, semicylindrical stones in said slots, slots in said body aligned with the center of said apertures and extended inwardly from one end of the body, and an operating device within the center of the body having extending arms thereon one for each of said slots for engaging adjacent end faces of the stones and for moving the stones along their longitudinal length to advance the opposite end faces of the stones from the side of the body.

2. In a honing tool having a body containing a plurality of angularly disposed cylindrical slots opening from the body at the extreme end thereof, a backing block within each slot changing the cross section of the apertures to semicylindrical shape, semicylindrical stones in said slots, slots in said body aligned with the center of said apertures and extended inwardly from one end of the body, and an operating device within the center of the body having extending arms thereon one for each of said slots for engaging adjacent end faces of the stones and for moving the stones along their longitudinal length to advance the opposite end faces of the stones from the side of the body, said body having a central aperture and said stones converging toward said aperture to have the faces of the stones move thereinto.

3. In a honing tool having a body containing a plu- 2,911,768 a, Q s.

rality of angularly disposed cylindrical slots opening from the body at the extreme end thereof, a backing block within each slot changing the cross section of the apertures to semicylindrical shape, semicylindrical stones in said slots, slots in said body aligned with the center of said apertures and extended inwardly from one end of the body, and an operating device within the center of the body having extending arms thereon one for each of said slots for engaging adjacent end faces of the stones and for moving the stones along their longitudinal length to advance the opposite end faces of the stones from the side of the body, said stones diverging downwardly to extend from the outer side surface of the body near the bottom thereof when said adjusting device and arms are moved downwardly.

References Cited in the file of this patent UNITED STATES PATENTS 431,713 Whaley July 8, 1890 2,054,495 Corkum Sept. 15, 1936 2,105,762 Zimmerman Jan. 18, 1938 2,336,043 Staples Dec. 7, 1943 2,344,036 Franck Mar. 14, 1944 2,694,885 Peden Nov. 23, 1954 FOREIGN PATENTS 519,691 Germany Mar. 3, 1931 

